The production date of 1.Mac lipstick is on the bottom label.

2. The second represents the month of production and the year of production in Theory of Three Represents.

3. The second number 1-9 on the label at the bottom of lipstick means1-September,1October,1October,1February, which are represented by a, b and c respectively.

4. If the third digit on the bottom label of lipstick is 9, it means that it was produced in 20 19. For example, if the batch number is BA8, the production date is 20 18 10.

5. The shelf life of 5.Mac lipstick is the same as other lipsticks, usually 3 years. After you buy Mac lipstick, you can use it for another year or two if you don't use it.

6. However, if lipstick has been opened for use, it is best to use it within six months, because lipstick will breed bacteria for a long time, which is not good for everyone's health.